 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.update.core;

 import org.eclipse.update.core.model.ImportModel;
 import org.eclipse.update.internal.core.UpdateCore;
 import org.eclipse.update.internal.core.UpdateManagerUtils;

 /**
  * Convenience implementation of a plug-in dependency.
  * <p>
  * This class may be instantiated or subclassed by clients.
  * </p>
  * <p>
  * <b>Note:</b> This class/interface is part of an interim API that is still under development and expected to
  * change significantly before reaching stability. It is being made available at this early stage to solicit feedback
  * from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
  * (repeatedly) as the API evolves.
  * </p>
  * @see org.eclipse.update.core.IImport
  * @see org.eclipse.update.core.model.ImportModel
  * @since 2.0
  */
 public class Import extends ImportModel implements IImport {

     //PERF: new instance variable
 private VersionedIdentifier versionId;

     /**
      * Returns an identifier of the dependent plug-in.
      * @see IImport#getVersionedIdentifier()
      */
     public VersionedIdentifier getVersionedIdentifier() {
         if (versionId != null)
             return versionId;

         String id = getIdentifier();
         String ver = getVersion();
         if (id != null && ver != null) {
             try {
                 versionId = new VersionedIdentifier(id, ver);
                 return versionId;
             } catch (Exception e) {
                 UpdateCore.warn("Unable to create versioned identifier:" + id + ":" + ver); //$NON-NLS-1$ //$NON-NLS-2$
 }
         }

         
         versionId = new VersionedIdentifier("",null); //$NON-NLS-1$
 return versionId;
     }

     /**
      * Returns the matching rule for the dependency.
      * @see IImport#getRule()
      */
     public int getRule() {
         return UpdateManagerUtils.getMatchingRule(getMatchingRuleName());
     }
     
     /**
      * Returns the matching rule for the dependency identifier.
      * @see IImport#getIdRule()
      */
     public int getIdRule() {
         return UpdateManagerUtils.getMatchingIdRule(getMatchingIdRuleName());
     }
     
     /**
      *
      * @see org.eclipse.update.core.IImport#getKind()
      */

     /**
      * Returns the dependency kind
      * @see org.eclipse.update.core.IImport#getKind()
      */
     public int getKind() {
         return isFeatureImport()?KIND_FEATURE:KIND_PLUGIN;
     }

 }

